Heehee!
My daughter is sewing a pair of pants right now, and she ran into trouble doing the top stitching with her Janome TB30, birds nests underside.
I told her she could use one of my machines. I told her that I have a couple that produce beautiful top and bottom stitches. Well, the look of horror on her face made just made me laugh. I told her not the TREADLES, but my 401 or FW. She said maybe...no that's okay. Well, I got the 401 out, set it up, did a test run with fabric and thread. And she said "Your machine WINS".
So, she sits down to work with the 401, hits the foot pedal, and says "oh, man, this machine goes". heehee She also said " that big hunker of a thing goes faster than my Janome". So now, she is getting use to the 401's speed and learning to control the machine to use for her top stitching. I told her she could still try a treadle. :)